Well, the subject described what I had to say all of you, yes, NocatSplash have been included in Tomato RAF and extensive to all Tomato version in the git (will upload in few hours).
User Manual is included in the menu for Captive Portal, I described all the steps to run a Captive Portal in your router and also possibilities to upload your own welcome banner to users accessing your router.

Enjoy and let me know any bug you may encounter, I tested some days before release but who knows… you can download from my site; victek.is-a-geek.com Tomato RAF Tab.